sabjr,
I went with the Corsa, b/c that is what the dealer had and I did not want any warranty issues. It definitely improves throttle response and sounds real nice. I do not buy their noise cancelling technology claim too much, it does get a little too loud around my normal cruising speed 80-90 mph and I tend to slow down for phone calls cause of the noise. I chose the sport b/c that's all the dealer had in stock that day. The touring is supposedly a little quiter. It does sound so much better outside, reminds me a little of my first car, 1968 Firebird convertible.
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